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Actually session manager have three mode. First is open new session on login. Second is restore previous session and last restore saved session.

I think user don't won't change option, which are very hard to understood and never before uses it(on KDE default mode is brink blank session). I think about two changes, to make session manager behaviour very similar to Firefox offers.

Firstly, user need a button save current session/windows button on shutdown/logout dialog. Secondly session manager should writes session for some times. I know, that it will be very hard to realize, because session manager will only stores some window id for application(we can't remember other information).

We must test it is correct behaviour for all application - saving session information neither application is correctly closed.

After user login it will brink dialog to him: Your previous session was not closed. What do you want:
- Run programs in autostart and open blank session
- Reopen previous session
- Run blank session without autostart
- What you would to do on option <might select>

Four option will brink dialog with list of programs/window to run/reopen and user will have to disable some.

This looks like three different ideas: session save button, automatic session save, and session restore popup. Please make separate ideas for each of these.